204 lines
5.0 KiB
Python
204 lines
5.0 KiB
Python
from .response import text, html
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from .log import log
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from traceback import format_exc, extract_tb
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import sys
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TRACEBACK_STYLE = '''
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<style>
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body {
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padding: 20px;
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font-family: Arial, sans-serif;
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}
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p {
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margin: 0;
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}
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.summary {
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padding: 10px;
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}
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h1 {
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margin-bottom: 0;
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}
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h3 {
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margin-top: 10px;
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}
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h3 code {
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font-size: 24px;
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}
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.frame-line > * {
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padding: 5px 10px;
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}
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.frame-line {
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margin-bottom: 5px;
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}
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.frame-code {
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font-size: 16px;
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padding-left: 30px;
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}
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.tb-wrapper {
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border: 1px solid #f3f3f3;
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}
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.tb-header {
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background-color: #f3f3f3;
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padding: 5px 10px;
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}
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.frame-descriptor {
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background-color: #e2eafb;
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}
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.frame-descriptor {
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font-size: 14px;
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}
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</style>
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'''
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TRACEBACK_WRAPPER_HTML = '''
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<html>
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<head>
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{style}
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</head>
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<body>
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<h1>{exc_name}</h1>
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<h3><code>{exc_value}</code></h3>
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<div class="tb-wrapper">
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<p class="tb-header">Traceback (most recent call last):</p>
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{frame_html}
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<p class="summary">
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<b>{exc_name}: {exc_value}</b>
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while handling uri <code>{uri}</code>
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</p>
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</div>
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</body>
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</html>
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'''
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TRACEBACK_LINE_HTML = '''
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<div class="frame-line">
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<p class="frame-descriptor">
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File {0.filename}, line <i>{0.lineno}</i>,
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in <code><b>{0.name}</b></code>
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</p>
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<p class="frame-code"><code>{0.line}</code></p>
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</div>
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'''
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INTERNAL_SERVER_ERROR_HTML = '''
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<h1>Internal Server Error</h1>
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<p>
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The server encountered an internal error and cannot complete
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your request.
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</p>
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'''
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class SanicException(Exception):
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def __init__(self, message, status_code=None):
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super().__init__(message)
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if status_code is not None:
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self.status_code = status_code
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class NotFound(SanicException):
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status_code = 404
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class InvalidUsage(SanicException):
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status_code = 400
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class ServerError(SanicException):
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status_code = 500
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class FileNotFound(NotFound):
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status_code = 404
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def __init__(self, message, path, relative_url):
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super().__init__(message)
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self.path = path
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self.relative_url = relative_url
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class RequestTimeout(SanicException):
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status_code = 408
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class PayloadTooLarge(SanicException):
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status_code = 413
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class Handler:
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handlers = None
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def __init__(self, sanic):
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self.handlers = {}
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self.sanic = sanic
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def _render_traceback_html(self, exception, request):
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exc_type, exc_value, tb = sys.exc_info()
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frames = extract_tb(tb)
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frame_html = []
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for frame in frames:
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frame_html.append(TRACEBACK_LINE_HTML.format(frame))
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return TRACEBACK_WRAPPER_HTML.format(
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style=TRACEBACK_STYLE,
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exc_name=exc_type.__name__,
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exc_value=exc_value,
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frame_html=''.join(frame_html),
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uri=request.url)
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def add(self, exception, handler):
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self.handlers[exception] = handler
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def response(self, request, exception):
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"""
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Fetches and executes an exception handler and returns a response object
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:param request: Request
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:param exception: Exception to handle
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:return: Response object
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"""
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handler = self.handlers.get(type(exception), self.default)
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try:
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response = handler(request=request, exception=exception)
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except:
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log.error(format_exc())
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if self.sanic.debug:
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response_message = (
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'Exception raised in exception handler "{}" '
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'for uri: "{}"\n{}').format(
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handler.__name__, request.url, format_exc())
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log.error(response_message)
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return text(response_message, 500)
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else:
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return text('An error occurred while handling an error', 500)
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return response
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def default(self, request, exception):
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log.error(format_exc())
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if issubclass(type(exception), SanicException):
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return text(
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'Error: {}'.format(exception),
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status=getattr(exception, 'status_code', 500))
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elif self.sanic.debug:
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html_output = self._render_traceback_html(exception, request)
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response_message = (
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'Exception occurred while handling uri: "{}"\n{}'.format(
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request.url, format_exc()))
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log.error(response_message)
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return html(html_output, status=500)
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else:
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return html(INTERNAL_SERVER_ERROR_HTML, status=500)
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